Boiler.



PAIENTED JAN. 27, 1903.

A. JAEGER.

BOILER.

APPLICATION FILED MAR. 5, 1902.

2 SHEETS-SHEET 1.

N0 MODEL.

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PATENTED JAN. 27, 1903.

A; JAEGER.

BOILER.

APPLICATION FILED HA3. 5, 1902.

2 SHEETS-SHEET 2.

N0 MODEL.

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BOILER.

SEEGIFIGATION forming part of Letters Patent N 0. 719,224, dated January 27, 1903.

Application filed March 5, 1902.

T0 air/Z5 whom it may concern;

Be it known that I, ALBERT J AEGER, a citizen of the United States, and a resident of J ersey City, in the county of Hudson and State of New Jersey, have invented a new and useful Improvement in Boilers, of which the following is a full, clear, and exact description.

My invention relates to cast-iron steamboilers especially adapted for heating purposes; and the object of the invention is to provide a boiler of such type in which will be combined the action of a water and a fire tube boiler with a jacket-chamber receiving products of combustion and heat usually wasted, in which jacket water-tubes are placed connecting with the steam-chamber below the water-line and with the water-leg of the boiler; and a further object of the invention is to so construct the sections of the boiler that perfect communication will be established between them, the communications being both water and steam tight fittings.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a vertical central section through the improved boiler, taken practically on the line 1 1 of Fig. 2. Fig. 2 is a horizontal section taken substantially on the line 2 2 of Fig. 1. Fig. 3 is a detail perspective View of one I of the tubes of the boiler adapted to be placed in the jacket-chamber. Fig. 4 is a vertical central section through the boiler, taken practically on the line 4 4 of Fig. 2. Fig. 5 is a horizontal section taken substantially on the line 5 5 of Fig. 1. Fig. 6 is a horizontal section taken practically on the line 6 6 of Fig. 4, and Fig. 7 is a horizontal section taken substantially on the line 7 7 of Fig. 4.

A represents the base of the boiler, in which the ash-pit a is located, and B represents the outer or main water-tube boiler, and B the innerorsecondaryfire-tubeboiler. The main and secondary boilers are circular in crosssection, and the lower end of the main boiler is fitted in the base A around the grate 10, being suitably supported in said base. The

$erial N0. 96,784. (No model.)

main boilerB is provided with an outer shell 11 and an inner shell 12, the space between the two shells constituting practically a circular water-leg, as the two sections are connected at the bottom of the main boiler, and therefore the lower end of the water-chamber 13 is closed.

At a point above the furnace O, which is the space above the grate 10, the outer shell of the main boiler B is carried horizontally outward, forming an annular step 14, as is best shown in Figs; 1 and 4, and the inner shell 12 at a corresponding point is given a downward and outward curve, as is shown at 14 in said Figs. 1 and 4. The main boiler B is made in two semisections b and b, and each section of the main boiler is provided with a top plate 15, connected with vertical partitions 16, the partitions of the two sections being adapted to be in close engagement when the sections of the main boiler are brought together, and these partitions 16 connect with a horizontal bottom plate 17, the said plate being integral with the upper portion of the inner shell 12 of the main boiler. Thus above the plate 17 a steam-chamber D is formed. Communication is established between the steam-chambers of the two sections 19 and b, and the sections of the main boiler at the upper portion of the. latter are connected in the following manner: Registering openings are made in the central portion of the partition 1G,.as is shown in Figs. 4 and 6, and the walls of these openings incline in reverse directions to receive a bush-nipple 18, the outer face of which is inclined from the center in opposite directions toward its ends, so that when the nipple is fitted in the apertures of the partitions 16 and the sections of the main boiler are forced close together there will be a wedge engagement between the outer face of the nipple and the walls of the apertures in the partitions 16 through which the nipple passes. A rod 19 is passed centrally through the bush-nipple 18 and through the outer shell 11 of the main boiler and through an outer jacket E, to be hereinafter described. The rod 19 likewise passes through spacing-blocks 20, formed upon the outer face of the outer shell 11 and the inner face of said jacket E, as is shown in Fig. 4. This tie-rod 19 is provided with suitable nuts at its outer ends and may stop at the outer shell of the boiler.

The sides of the water-chambers 13 in the sections of the main boiler are closed by vertical partitions 21, (shown in Figs. 2 and 7,) and at the lower portion of the main boiler where the sections come together offsets 22 are formed in the outer shell 11, as is shown in Fig. 7. Bush-nipples 23 are passed through apertures in the partitions 21 in like manner, as has been described with reference to the bush-nipple 18, the bush-nipples 23 and 18 being alike in construction. The offsets 22 are formed in order that tie-rods 24 when passed through the bush-nipple 23 for the purpose of tying the lower ends of the sections of the main'boiler together will have its end nuts at the outer face of the boiler and within easy reach of the operator.

A suitable distance below the inner plate 17 of the main boiler a flue-sheet 25 is firmly secured to the inner shell 12 of the main boiler, and the space between the flue-sheet 25 and the plate 17 or bottom portion of the steam-chamber D constitutes a combustionchamber F, as is shown in Figs. 1 and 4. The inner or fire-tube boiler B is located below the flue-sheet 25, the upper flue-sheet of the fire-tube boiler B being in engagement with the under face of the flue-sheet 25, fixed to the main boiler B, and a space 26 intervenes the inner shell 12 of the main boiler B and the sides of the inner or lire-tube boiler B. The bottom flue-sheet of the inner or tire-tube boiler is directly over the furnace O and is brought in contact with the first products of combustion, and the fire-tubes 27 are passed through the bottom sheet of the inner or firetube boiler and through its upper flue-sheet to the flue-sheet 25, forming the bottom of the combustion-chamber F, the ends of the fire-tubes 27 beingsuitably expanded.

The inner or fire-tube boiler B is supported in its position by a circulating-tube 28. This tube 28, as is shown in Fig. 4, connects with the water-chamber 13 of the main boiler at the bottom thereof and is passed through the said chamber below the inner or fire-tube boiler at one side of its center and out through the opposite walls of the main boiler and is then returned inward beneath and in engagement with the bottom of the inner or fire-tube boiler B and is carried out at the-opposite side of the main boiler to a connection with the steam-chain ber D at a point below its water-line, as is shown in dotted lines in Fig. 1.

The water-chamber of the inner or fire-tube boiler Bis connected with the bottom por tion orwater-leg ot' the water-chamber 13 of the main boiler B by means of a circulatingtnbe 29, (shown in Fig. 1,) which extends up ward at the outside of the main boiler B and is carried inward through the Water-chamber 13 to a connection with the water-chamber of the inner boiler B at a point near the bottom flue-sheet of said inner boiler.

Asecond connection is established between the inner boiler B and the steam-chamber D of the main boiler B, and such communication is made through the medium of a circulating-tube 30, which connects with the upper portion of the water-chamber of the inner boiler and with the bottom portion of the steam-chamber D, as is also shown in Fig. 1, and I desire it to be understood that more than one of the circulating-tubes 29and 30 may be employed if it be found desirable.

It will be observed that the circulating and supporting tube 28 in its passage through the boiler is carried directly through the furnace C and receives the first products of combustion.

A jacket E for the main boiler B extends down below the annular step 14 in closeairtight engagement with the outer shell of the said main boiler, as is shown in Fig. 4, and said jacket extends up to the top of the main boiler and is provided with a top plate 31, which rests upon the upper plates 15 of the sections of the main boiler B, as is shown in both Figs. 1 and 4.

At the front of the boiler the combustionchamber F is open, as is shown at 32 in Figs. 1 and 5, thus establishing directcommunication between said combustion-chamber F and the annular chamber e, formed by the application of the jacket E, as is shown in Figs. 1 and 5, and opposite this opening 32 in the combustion-chamber F the jacket E is provided with a vertical breast Immediately opposite the outlet 32 of the combustionchamber F a door 34 is formed in the breast 33, so that the interior of thecombustionchamber may be conveniently reached for cleaning purposes.

It will be observed that the products of combustion ordinarily wasted are here received and confined in the jacket-chamber e, and these combined gases andproducts (if combustion are utilized to heat series of watertubes H, which are arranged in any desired number partially within the jacket-chamber e, as is shown in Figs. 2 and 5. One of these tubes H is shown in detail in Fig. 3. The lower ends of the tubes H communicate with the waterchamber 13 of the main boiler through the annular stepped section 14, asis shown in Fig. 4, and at the upper end of each tube H a horizontal section of pipe 35 is coupled through the medium of an elbow 36 or similar fitting, and a second elbow 37 is connected with the horizontal section 35 and carries a nipple 38, which nipple is passed into the steam-generating chamber D at a point below its water-line and preferably j ust above the bottom line of said chamber, as is shown in dotted lines in Fig. 4. The horizontal sections 35 are provided for the auxiliary circulating-tubes H to overcome expansion and contraction, as the said horizontal sections 35 will be capable of yielding through their fittings to a greater or less extent without affecting'their connection withthe steam generating chamber.

I wish it to be understood that, if it be desired, the auxiliary circulating-tubes H may be made of much greater diameter above the step 14 than at their lower ends, which are passed through the step, so as to present the greatest possible amount of heating-surface to the gases in the jacket-chamber e.

A suitable bridging 39 is connected with the lower portion of the jacket-chamber e at the back of the boiler, and a stack 40 is connected with the bridging. The boiler is provided With a suitable offtake pipe 41 for steam,which pipe is connected with the steamgenerating chamber D of the main boiler, and the boiler is provided with the usual diaphragm 42, arranged to operate the checkdamper 43, as is shown in Fig. 1.

The tubes are made either of cast iron or steel in one piece, with the necessary inlet and outlet connections. High-pressure boilers of this type are made of steel and the auxiliary tubes are placed in the smoke-chamber, and when the boiler is made of steel the offset or step 14 is omitted. The reason the ofiset or step is used in the cast-iron form of boiler is to provide a large grate area, insuring perfect safety and satisfaction with but little necessary attention. Any suitable form of setting may be provided for the boiler.

A boiler construction as above is perfectly safe and has great evaporative capacity by reason of the large amount of heating-surface for the furnace and the direct action of the beat upon the central tubes, which creates a rapid circulation in the boiler, and also by reason of having the tubes submerged, which provides for even expansion, and the large combustion-chamber, all of which construction tends to the consumption of a maximum portion of the gases, and in consequence great economy in fuel is obtained. Furthermore, the heated gases before passing off enter the jacket-chamber e and come in direct contact with the auxiliary tubes H and the outer shell of the boiler, and all available heat units are utilized before the escape of the gases through the stack 40 is possible.

Having thus described my invention, I claim as new and desire to secure by Letters Patent-- 1. In a boiler, the combination of a main boiler having a steam-chamber and waterlegs, a fire-tube boiler arranged in the main boiler over the grate thereof, a combustionchamber between the steam-chamber of the main boiler and the fire-flue boiler, a chamber around the main boiler and with which the said combustion-chamber communicates, and ciroulatingtubes in said outer chamber and connected with the water-legs and steamchamber of the main boiler, as set forth.

2. In boilers, the combination with the we.- tel-legs having an exterior stepped extension at the furnace of the boiler and the steamgenerating and combustion chambers of the boiler, of a jacket spaced from the outer shell of the boiler and extending below the stepped extension of the water-legs, forming a jacketchamber, a connection between the jacketchamber and the combustion-chamber,a stack connected with the jacket-chamber, and a series of circulating-tubes within the jacketchamber, extending through the stepped extension of the water-legs into the same and connected at their upper ends with the steamgenerating chamber below the water -line thereof, substantially as described.

3. In boilers, the combination with the water-legs having an exterior stepped extension at the furnace of the boiler, a steam-generating chamber, into which the upper ends of water-legs lead and a combustion-chamber, of a jacket spaced from the outer shell of the boiler and extending below the step of the wator-leg, forming a jacket-chamber, surround,- ing the upper part of the water-legs, a connection between the jacket-chamber and the combustion-chamber, a stack connected with the jacket-chamber, a series of circulatingtubes within the jacket-chamber, which tubes are vertically arranged and'have their lower ends passed through the stepped extension of the water-legs into the same, a horizontal section coupled to the upper end of each circulating-tube, which upper sections of the circulating-tubes have horizontal connection with the steam-generatin g chamber at a point below the water-line in said chamber, as and for the purpose set forth.

4:. In boilers,an outer water-tube boiler and an inner fire-tube boiler,the Water-tube boiler being provided with a steam-generating chamber and a furnace, the fire-tube boiler being located over the furnace and below and spaced from the steamgenerating chamber, forming a combustion-chamber between the top of said fire-tube boiler and steam-generating chamber of the water-tube boiler, and circulating-pipes connecting the water-chambers and steam-generating chambers of the Watertube boiler with the water-chamber of the fire tube boiler, for the purposes described.

5. In a boiler, the combination of a main boiler having a steam-chamber in its upper portion and water-legs communicating therewith, a fire-flue boiler arranged in the main boiler-over the grate thereof, the upper end of the fire-fine boiler being spaced from the steam-chamber to form a combustion-chamber,and connections between the water-chamber of the fire-flue boiler and the steam-chamber and water-legs of the main boiler, as set forth. 7

6. In a steam-boiler, the combination with a main boiler having steam and water chambers, of a fire-tube boiler in the main boiler over the grate thereof, connections between the water-chamber of the fire-tube boiler and the steam and water chambers of the main boiler, and a circulating-tube extending under the fire-tube boiler and having one end connected with the waterchamber and its other end with the steam-chamber of the main boiler, as set forth.

7. In a steam-boiler, the combination of a main boiler having steam and water chambers, a fire-flue boiler arranged in the main boiler above the grate thereof, the upper end of the fire-flue boiler being spaced from the bottom of the steam-chamber of the main boiler forming a combustion-chamber, tubes connecting the upper and lower portions of the water-chamber of the fire-flue boiler with the steam and Water chambers respectively of the main boiler, a jacket surrounding the main boiler and forming a chamber with which the 

